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Goodwill (Details) $ in Millions	3 Months Ended				6 Months Ended
	Apr. 30, 2021 USD ($)	Jan. 31, 2021 segment	Apr. 30, 2020 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Nov. 01, 2020 USD ($)	Oct. 31, 2020 USD ($)
Goodwill
Goodwill	$ 18,017				$ 18,017			$ 18,017
Impairment of goodwill	0		$ 865		0	$ 865
Goodwill impairment	953				953
Number of segments | segment		6
Minimum
Goodwill
Percentage of fair value in excess of carrying amount							8.00%
Maximum
Goodwill
Percentage of fair value in excess of carrying amount							37.00%
Compute
Goodwill
Goodwill	7,532				7,532			7,532
HPC & MCS
Goodwill
Goodwill	3,616				3,616		$ 3,600	3,616
Impairment of goodwill			$ 865
Percentage of fair value in excess of carrying amount							8.00%
Storage
Goodwill
Goodwill	3,946				3,946			3,946
Intelligent Edge
Goodwill
Goodwill	2,566				2,566			2,566
Financial Services
Goodwill
Goodwill	144				144			144
Corporate Investments and Other
Goodwill
Goodwill	$ 213				$ 213			$ 213
Amount of transfer in goodwill							$ 213
CMS Reporting Unit
Goodwill
Goodwill				$ 0
Impairment of goodwill				$ 88

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